[Stoves] Gas Sensing

[Chris Roden]

Lanny:

80 ft^3, That's a pretty small room 4 feet x 4 feet x 5 feet - how is the cook going to fit in there?

I get about:
7.62 m^3_air / 1 kg_wood


Here are the numbers I used:
Wood = 
C5H7O3 or 
CH1.4O0.6


C5H7O3  +  5.25 O2  =>  5 CO2   +   3.5 H20

168 g O2 / 115 g wood
  or
1.46 kg O2 / 1 kg wood

By mass 23% of air is O2
230 g O2 / 1000 g air

Air density: 1.2 kg_air/m^3 (20 deg C, 1atm)

So start with 1 kg of wood:
1 kg_wood  * ( 1.461 g_O2 /  kg_wood )   *   ( 1 kg air / 0.23 kg O2)  *  ( 1 m^3 / 1.2 kg_air )  = 

7.62 m^3_air / 1 kg_wood


Hope this helps - you better build a bigger kitchen!!

Chris R.

---- Original message ----
>Date: Sat, 9 Feb 2008 12:57:28 -0500
>From: "Lanny Henson" <lannych at bellsouth.net>  
>Subject: Re: [Stoves] Gas Sensing  
>To: "Discussion of biomass cooking stoves" <stoves at listserv.repp.org>
>
>I have 80 cubic feet of room and I want to burn 500 grams of oak.
>What percentage of the 02 will be converted assuming  there is good 
>combustion?
>Will I have enough 02 as to not effecting the dynamics?
>The exhaust will rise and the fresh air will stay low so the stove may be 
>able to pick up fresh air through most of the burn.
>If that does not work, I will pipe in fresh combustion air, and let some air 
>exhaust at the lowest point.
>Lanny
>
>----- Original Message ----- 
>From: "Steve Taylor" <Steve at thetaylorfamily.org.uk>
>To: "Discussion of biomass cooking stoves" <stoves at listserv.repp.org>
>Sent: Saturday, February 09, 2008 8:01 AM
>Subject: Re: [Stoves] Gas Sensing
>
>
>> Lanny Henson wrote:
>>> LH- I like this idea, I am also planning to set up a sealed room to test
>>> stoves. I was planning to do a complete test burn inside a sealed room 
>>> with
>>> a known volume and then check the gas levels.
>>>
>>>
>> How realistic can that be ? As the O2 burns the whole dynamics of the
>> burn are likely to be altered, if the room is small enough to have a
>> significant change in gas ratios.
>>
>> Steve
>>
>>
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